-
- Home
- Journals
- Bulletin of Materials Science
- Volume 45
- All articles
-
Microstructural, mechanical and phase formation behaviour of sintered mullite prepared from kaolinite and reactive alumina: effect of La$_2$O$_3$
PALLAVI SUHASINEE BEHERA SUNIPA BHATTACHARYYA
Volume 45 Published: 9 June 2022 Article ID 0104
-
-
Fulltext
Click here to view fulltext PDF
Permanent link:
https://www.ias.ac.in/article/fulltext/boms/045/0104 -
Keywords
Mullite ;La$_2$O$_3$ ;phase formation ;sintering ;microstructure. -
Abstract
Clay and reactive alumina were used to prepare mullite ceramic by wet mixing, followed by the solid-state sintering method. The influence of lanthanum oxide (La$_2$O$_3$) additive for phase formation, microstructural evolution, densification, flexural strength, hardness and thermal shock resistance was studied. The calculated amount of the raw materials, i.e., kaolinite, reactive alumina and different wt% La$_2$O$_3$ additive according to the stoichiometric composition of mullite (3Al$_2$O$_3$.2SiO$_2$) were wet mixed, dried and uniaxially pressed, followed by sintering at different temperatures for 2 h. The La$_2$O$_3$ substitution (3 wt%) positively impacts mullitization by reducing phase formation temperature. A quantity of 3 wt% La$_2$O$_3$ added batch sintered at 1600°C shows strength and bulk density of 196.5 MPa and 3.041 g cm$^{-3}$, respectively. Columnar grains with interlocked morphology were formed by adding a La$_2$O$_3$ additive that improves the bending strength. Retention of strength after 9 cycles of thermal shock is measured and found satisfactory. Higher quantity La$_2$O$_3$ addition showed a deleterious effect on bending strength and hardness of the samples.
-
Author Affiliations
PALLAVI SUHASINEE BEHERA SUNIPA BHATTACHARYYA1
- Department of Ceramic Engineering, National Institute of Technology, Rourkela 769008, India
-
Dates
- Published
- 9 June 2022
- Manuscript received
- 20 July 2021
- Accepted
- 3 February 2022
- Final version published online
- 9 June 2022
-
-
Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
-
Bulletin of Materials Science | News
-
Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
-